White produces a really good effect only with blue and orange, or blue and red, being much inferior with green and yellow, or blue and yellow. It is, however, very suitable for trousers, with any combination of two agreeable colours in the coat. Nothing more clearly demonstrates the advantage of blue or red with white, than the difference between a uniform of deep red and blue without white, and the same with white facings and buff-skin belt, &c. _Bi-coloured Uniforms with Black._ Black enters advantageously into the composition of many uniforms of two luminous colours, such as scarlet, orange, yellow, or bright green. A scarlet coat with facings of greenish, rather than orange, yellow, is perfectly adapted to black trousers. And black trousers may be associated with sombre colours in the other parts of the dress for a uniform which is not to be conspicuous or seen far off. _Uniform of more than two Colours, not comprising Black and White._ Although three colours may be combined without producing a bad effect, yet I give the preference to a bi-coloured dress with a mixture of black and white. And I may remark here that if the sight of several colours be more agreeable than of one only, there are disadvantages in the union of many colours, especially if the colours are scattered on different objects, or several parts of the same object. _Uniform of several Shades of the same Colour._ Strictly speaking, it is possible to make an agreeable arrangement of colours belonging to the same or neighbouring scales; yet the difficulty of doing this, and the chances of success where there is a contrast of colour, determine me to reject the former, at least whenever brilliant colours are employed; but for sombre-coloured arrangements they may be employed. In proof of this, I will mention the bad effect of those French uniforms, in which there is a juxtaposition of madder and of cochineal reds. _Uniforms of two Tones of the same Scale._ This arrangement is not successful, for the lighter loses its colour, and if the deep tone acquire it, it is scarcely ever advantageous.[3] We will not therefore dwell upon it. [3] It must be remembered that Chevreul speaks here of colours exclusively as to their optical effect, and that the very objection which he states to such an arrangement of colours, would be one of its best recommendations to the advocates of an obscure, in preference to a conspicuous uniform, as for Rifle Corps. _Of a Mono-coloured Uniform._ If uniforms of contrasted colours are advantageous in an economical point of view, if light coloured uniforms present advantages when it is desirable to exhibit to the enemy the numbers who oppose him, there are many cases in which the object is rather to conceal and dissimulate their presence, than to display them. Well, for such purposes, or if there is to be established a sort of hierarchy among the various corps, by means of dress, we may have recourse to a single and sombre-coloured uniform.